State of WKWebView on Cordova iOS 9?

However WKWebView on iOS 8 had some bugs which prevented Cordova using it by default. AFAIK there are plugins that can use it, but they all say "beta", "incomplete" etc. Also as far as I'm aware iOS 9 fixes the bugs that stopped Cordova defaulting to WKWebView in iOS 8.

So what is the state of WKWebView in Cordova on iOS 9? I can't seem to find any information about this. Does Cordova default to WKWebView on iOS 9? If not why not, and can it be officially enabled another way?

As the bug you mention is fixed on iOS 9, the current cordova plugin (compatible with iOS 8 and iOS 9, using the web server) has been renamed to wkwebview-engine-localhost, and the current name cordova-plugin-wkwebview-engine will be used for a new plugin that will support iOS 9 only and won't use the web server

The cordova-plugin-wkwebview-engine plugin will be iOS 9 only and it
will be a core plugin. The development of this updated plugin is still
in progress. Apple has fixed the bug where we couldn’t load documents
from file:// urls, and it is iOS 9 only. On non-iOS 9 devices,
cordova-ios will fallback to using the UIWebView.

The old version of this plugin used a local webserver to load your
main document. This older plugin can be used where you want to use
WKWebView in both iOS 8 and iOS 9 deployments, but the plugin will
remain as a cordova-labs experiment. This plugin has some re-factoring
work to be done.